<template>
  <div class="wrapper">
    <!-- header部分 -->
    <header>
      <p>商家信息</p>
    </header>

    <!-- 商家logo部分 -->
    <div class="business-logo">
      <img :src="business.businessImg" />
    </div>

    <!-- 商家信息部分 -->
    <div class="business-info">
      <h1>{{business.businessName}}</h1>
      <p>&#165;{{business.starPrice}} 起送 &#165;{{business.deliveryPrice}}</p>
      <p>{{business.businessExplain}}</p>
    </div>
    <!-- 食品列表部分 -->
    <ul class="food">
      <li v-for="(item,index) in foodArr" :key="index">
        <div class="food-left">
          <img :src="item.foodImg" alt />
          <div class="food-left-info">
            <h3>{{item.foodName}}</h3>
            <p>{{item.foodExplain}}</p>
            <p>&#165;{{item.foodPrice}}</p>
          </div>
        </div>

        <div class="food-right">
          <div>
            <i class="fa fa-minus-circle" @click="minus(index)" v-show="item.quantity!=0"></i>
          </div>
          <p>
            <span v-show="item.quantity!=0">{{item.quantity}}</span>
          </p>
          <div>
            <i class="fa fa-plus-circle" @click="add(index)"></i>
          </div>
        </div>
      </li>
    </ul>

    <!-- 购物车部分 -->
    <div class="cart">
      <div class="cart-left">
        <div
          class="cart-left-icon"
          :style="totalQuantity==0?'background-color:#505051':'background-color:#3190e8'"
        >
          <i class="fa fa-shopping-cart"></i>
        </div>

        <div class="cart-left-icon-quantity" v-show="totalQuantity!=0">{{totalQuantity}}</div>
        <div class="cart-left-info">
          <p>&#165;{{totalPrice}}</p>
          <p>另需配送费{{business.deliveryPrice}}元</p>
        </div>
      </div>
      <div class="cart-right">
        <!-- 起送费不够 -->
        <div
          class="cart-right-item"
          v-show="totalSettle<business.starPrice"
          style="background:#535356,cursor: default;"
        >&#165;{{business.starPrice}}起送</div>
        <!-- 达到了配送费 -->
        <div class="cart-right-item" @click="toOrder" v-show="totalSettle>=business.starPrice">去结算</div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: "BusinessInfo",
  data() {
    return {
      //根据传递过来的路由参数取businessId
      businessId: this.$route.query.businessId,
      business: {},
      foodArr: [],
      user: {},
    };
  },
  created() {
    this.user = this.$getSessionStorage("user");
    //根据businessId查询商家ID
    this.$axios
      .post(
        "BusinessCtrl/getBusinessById",
        this.$qs.stringify({ businessId: this.businessId })
      )
      .then((response) => {
        this.business = response.data;
      })
      .catch((value) => {
        console.error(value);
      });

    //根据businessId查询所属食品信息
    this.$axios
      .post(
        "food/listFood",
        this.$qs.stringify({ businessId: this.businessId })
      )
      .then((response) => {
        this.foodArr = response.data;
        for (let i = 0; i < this.foodArr.length; i++) {
          this.foodArr[i].quantity = 0;
        }
        //如果用户已经登录了，需要取查询购物车中是否已经选购了某个商品
        if (this.user != null) {
          this.listCart();
        }
      })
      .catch((value) => {
        console.error(value);
      });
  },
  methods: {
    listCart() {
      this.$axios
        .post(
          "cart/listCart",
          this.$qs.stringify({
            businessId: this.businessId,
            userId: this.user.userId,
          })
        )
        .then((responese) => {
          let cartArr = responese.data;
          //遍历所有的食品的列表
          for (let item of this.foodArr) {
            item.quantity = 0;
            for (let cartItem of cartArr) {
              if (cartItem.foodId == item.foodId) {
                item.quantity = cartItem.quantity;
              }
            }
          }
          this.foodArr.sort();
        })
        .catch((value) => {
          console.error(value);
        });
    },
    add(index) {
      //先做登录验证
      if (this.user == null) {
        this.$router.push("/login");
        return;
      }
      if (this.foodArr[index].quantity == 0) {
        //等于0表示新增
        this.saveCart(index);
      } else if(this.foodArr[index].quantity>0) {
        //不等于0就是修改
        this.updateCart(index, 1);
      }
    },
    minus(index) {
      if (this.user == null) {
        this.$router.push("/login");
        return;
      }
      if (this.foodArr[index].quantity > 1) {
        this.updateCart(index, -1);
      } else if(this.foodArr[index].quantity==1){
        this.removeCart(index);
      }
    },
    saveCart(index) {
      this.$axios
        .post(
          "cart/saveCart",
          this.$qs.stringify({
            businessId: this.businessId,
            userId: this.user.userId,
			foodId: this.foodArr[index].foodId,
          })
        )
        .then((response) => {
          if (response.data == 1) {
            //食品数量更新为1
            this.foodArr[index].quantity = 1;
            this.foodArr.sort();
          } else {
            alert("向购物车中添加商品失败");
          }
        })
        .catch((value) => {
          console.error(value);
        });
    },
    updateCart(index, num) {
      this.$axios
        .post(
          "cart/updateCart",
          this.$qs.stringify({
            businessId: this.businessId,
            userId: this.user.userId,
            foodId: this.foodArr[index].foodId,
            quantity: this.foodArr[index].quantity + num,
          })
        )
        .then((response) => {
          if (response.data == 1) {
            this.foodArr[index].quantity += num;
            this.foodArr.sort();
          } else {
            alert("购物车中更新商品失败");
          }
        })
        .catch((value) => {
          console.error(value);
        });
    },
    removeCart(index) {
      this.$axios
        .post(
          "cart/removeCart",
          this.$qs.stringify({
            businessId: this.businessId,
            userId: this.user.userId,
            foodId: this.foodArr[index].foodId,
          })
        )
        .then((value) => {
          if (value.data == 1) {
            //商品数量更新为零了
            this.foodArr[index].quantity = 0;
            this.foodArr.sort();
          } else {
            alert("从购物车中删除食品失败");
          }
        })
        .catch((value) => {
          console.error(value);
        });
    },
    toOrder() {
      this.$router.push({
        path: "/orders",
        query: { businessId: this.business.businessId },
      });
    },
  },
  computed: {
    //商品总价格
    totalPrice() {
      let total = 0;
      for (let item of this.foodArr) {
        total += item.foodPrice * item.quantity;
      }
      return total;
    },
    //商品总的数量
    totalQuantity() {
      let quantity = 0;
      for (let item of this.foodArr) {
        quantity += item.quantity;
      }
      return quantity;
    },
    //商品加配送费的总价格
    totalSettle() {
      return this.totalPrice + this.business.deliveryPrice;
    },
  },
};
</script>

<style scoped>
/****************** 总容器 ******************/
.wrapper {
  width: 100%;
  height: 100%;
}

/****************** header部分 ******************/
.wrapper header {
  width: 100%;
  height: 12vw;
  background-color: #0097ff;
  color: #fff;
  font-size: 4.8vw;

  position: fixed;
  left: 0;
  top: 0;
  z-index: 1000;

  display: flex;
  justify-content: center;
  align-items: center;
}

/****************** 商家logo部分 ******************/
.wrapper .business-logo {
  width: 100%;
  height: 35vw;
  /*使用上外边距避开header部分*/
  margin-top: 12vw;

  display: flex;
  justify-content: center;
  align-items: center;
}
.wrapper .business-logo img {
  width: 40vw;
  height: 30vw;
  border-radius: 5px;
}

/****************** 商家信息部分 ******************/
.wrapper .business-info {
  width: 100%;
  height: 20vw;

  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.wrapper .business-info h1 {
  font-size: 5vw;
}
.wrapper .business-info p {
  font-size: 3vw;
  color: #666;
  margin-top: 1vw;
}

/****************** 食品列表部分 ******************/
.wrapper .food {
  width: 100%;
  /*使用下外边距避开footer部分*/
  margin-bottom: 14vw;
}
.wrapper .food li {
  width: 100%;
  box-sizing: border-box;
  padding: 2.5vw;
  user-select: none;

  display: flex;
  justify-content: space-between;
  align-items: center;
}
.wrapper .food li .food-left {
  display: flex;
  align-items: center;
}
.wrapper .food li .food-left img {
  width: 20vw;
  height: 20vw;
}
.wrapper .food li .food-left .food-left-info {
  margin-left: 3vw;
}
.wrapper .food li .food-left .food-left-info h3 {
  font-size: 3.8vw;
  color: #555;
}
.wrapper .food li .food-left .food-left-info p {
  font-size: 3vw;
  color: #888;
  margin-top: 2vw;
}
.wrapper .food li .food-right {
  width: 16vw;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.wrapper .food li .food-right .fa-minus-circle {
  font-size: 5.5vw;
  color: #999;
  cursor: pointer;
}
.wrapper .food li .food-right p {
  font-size: 3.6vw;
  color: #333;
}
.wrapper .food li .food-right .fa-plus-circle {
  font-size: 5.5vw;
  color: #0097ef;
  cursor: pointer;
}

/****************** 购物车部分 ******************/
.wrapper .cart {
  width: 100%;
  height: 14vw;

  position: fixed;
  left: 0;
  bottom: 0;

  display: flex;
}
.wrapper .cart .cart-left {
  flex: 2;
  background-color: #505051;
  display: flex;
}
.wrapper .cart .cart-left .cart-left-icon {
  width: 16vw;
  height: 16vw;
  box-sizing: border-box;
  border: solid 1.6vw #444;
  border-radius: 8vw;
  background-color: #3190e8;
  font-size: 7vw;
  color: #fff;

  display: flex;
  justify-content: center;
  align-items: center;

  margin-top: -4vw;
  margin-left: 3vw;

  position: relative;
}
.wrapper .cart .cart-left .cart-left-icon-quantity {
  width: 5vw;
  height: 5vw;
  border-radius: 2.5vw;
  background-color: red;
  color: #fff;
  font-size: 3.6vw;

  display: flex;
  justify-content: center;
  align-items: center;

  position: absolute;
  right: -1.5vw;
  top: -1.5vw;
}
.wrapper .cart .cart-left .cart-left-info p:first-child {
  font-size: 4.5vw;
  color: #fff;
  margin-top: 1vw;
}
.wrapper .cart .cart-left .cart-left-info p:last-child {
  font-size: 2.8vw;
  color: #aaa;
}

.wrapper .cart .cart-right {
  flex: 1;
}
/*达到起送费时的样式*/
.wrapper .cart .cart-right .cart-right-item {
  width: 100%;
  height: 100%;
  background-color: #38ca73;
  color: #fff;
  font-size: 4.5vw;
  font-weight: 700;
  user-select: none;
  cursor: pointer;

  display: flex;
  justify-content: center;
  align-items: center;
}

/*不够起送费时的样式（只有背景色和鼠标样式的区别）*/
/*
	.wrapper .cart .cart-right .cart-right-item{
		width: 100%;
		height: 100%;
		background-color: #535356;
		color: #fff;
		font-size: 4.5vw;
		font-weight: 700;
		user-select: none;
		
		display: flex;
		justify-content: center;
		align-items: center;
	}
	*/
</style>
